A series of supramolecular polymers based on hydrogen bonds with different structures were synthesized through the reaction between 1

12-diaminododecane (DDA) and acrylic acid (AA)

and then compounded with carboxyl nitrile rubber (XNBR) and other processing agents. After the sample being vulcanized

supramolecular polymers were formed

in situ

in the rubber matrix

thus sulfur crosslinked XNBR with high strength and toughness was prepared. The results showed that the tensile strength

modulus and toughness of the materials were improved by incorporating different supramolecular polymers. Specially

when the supramolecular polymer synthesized with the molar ratio of DDA to AA of 1∶3 was added to XNBR

the tensile strength and fracture energy of the material were 2.1 and 2.7 times that of the blank sample

respectively.This is because the fact that hydrogen bond

as a weak bond

will break prior to covalent bond when the material is under tension

which will dissipate a lot of energy in this process

thus improving the tensile strength and toughness of the material. In addition

the mechanism of energy dissipation and the time dependence of hydrogen bond fracture were further proven by cyclic tensile test and variable speed tensile test.